diff --git a/packages/happy-dom/src/navigator/Navigator.ts b/packages/happy-dom/src/navigator/Navigator.ts
index c03ec03fa..5e6104991 100644
--- a/packages/happy-dom/src/navigator/Navigator.ts
+++ b/packages/happy-dom/src/navigator/Navigator.ts
@@ -1,5 +1,6 @@
 import MimeTypeArray from './MimeTypeArray.js';
 import PluginArray from './PluginArray.js';
+import IWindow from '../window/IWindow.js';
 
 /**
  * Browser Navigator API.
@@ -10,6 +11,16 @@ import PluginArray from './PluginArray.js';
  * https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator.
  */
 export default class Navigator {
+	private _ownerWindow: IWindow;
+
+	/**
+	 *
+	 * @param ownerWindow
+	 */
+	constructor(ownerWindow: IWindow) {
+		this._ownerWindow = ownerWindow;
+	}
+
 	/**
 	 * False if setting a cookie will be ignored and true otherwise.
 	 */
@@ -84,14 +95,19 @@ export default class Navigator {
 	 * Browser app version.
 	 */
 	public get appVersion(): string {
-		return '5.0 (Windows)';
+		const userAgent = this.userAgent;
+		const index = userAgent.indexOf('/');
+		return index > -1 ? userAgent.substring(index + 1) : '';
 	}
 
 	/**
 	 * Browser platform.
 	 */
 	public get platform(): string {
-		return 'Win32';
+		const userAgent = this.userAgent;
+		const indexStart = userAgent.indexOf('(');
+		const indexEnd = userAgent.indexOf(')');
+		return indexStart > -1 && indexEnd > -1 ? userAgent.substring(indexStart + 1, indexEnd) : '';
 	}
 
 	/**
@@ -128,7 +144,7 @@ export default class Navigator {
 	 * "appCodeName/appVersion number (Platform; Security; OS-or-CPU; Localization; rv: revision-version-number) product/productSub Application-Name Application-Name-version".
 	 */
 	public get userAgent(): string {
-		return 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0';
+		return this._ownerWindow.happyDOM.settings.navigator.userAgent;
 	}
 
 	/**
diff --git a/packages/happy-dom/src/navigator/NavigatorUtility.ts b/packages/happy-dom/src/navigator/NavigatorUtility.ts
new file mode 100644
index 000000000..d2e1052b2
--- /dev/null
+++ b/packages/happy-dom/src/navigator/NavigatorUtility.ts
@@ -0,0 +1,29 @@
+import FS from 'fs';
+import Path from 'path';
+
+/**
+ * Utility for navigator.
+ */
+export default class NavigatorUtility {
+	/**
+	 * Returns the package version.
+	 *
+	 * @returns Package version.
+	 */
+	public static getHappyDOMVersion(): string {
+		const content = FS.readFileSync(Path.join(__dirname, '..', '..', 'package.json')).toString();
+		const json = JSON.parse(content);
+		return json.version;
+	}
+
+	/**
+	 * Returns platform.
+	 *
+	 * @returns Platform.
+	 */
+	public static getPlatform(): string {
+		const platform = process.platform;
+		const platformCapitalized = platform.charAt(0).toUpperCase() + platform.slice(1);
+		return 'X11; ' + platformCapitalized + ' ' + process.arch;
+	}
+}
diff --git a/packages/happy-dom/src/window/IHappyDOMOptions.ts b/packages/happy-dom/src/window/IHappyDOMOptions.ts
index 7d1e4e729..b005c4db2 100644
--- a/packages/happy-dom/src/window/IHappyDOMOptions.ts
+++ b/packages/happy-dom/src/window/IHappyDOMOptions.ts
@@ -13,6 +13,9 @@ export default interface IHappyDOMOptions {
 		disableIframePageLoading?: boolean;
 		disableComputedStyleRendering?: boolean;
 		enableFileSystemHttpRequests?: boolean;
+		navigator?: {
+			userAgent?: string;
+		};
 		device?: {
 			prefersColorScheme?: string;
 			mediaType?: string;
diff --git a/packages/happy-dom/src/window/IHappyDOMSettings.ts b/packages/happy-dom/src/window/IHappyDOMSettings.ts
index 0eec929ca..3212c13b5 100644
--- a/packages/happy-dom/src/window/IHappyDOMSettings.ts
+++ b/packages/happy-dom/src/window/IHappyDOMSettings.ts
@@ -8,6 +8,9 @@ export default interface IHappyDOMSettings {
 	disableIframePageLoading: boolean;
 	disableComputedStyleRendering: boolean;
 	enableFileSystemHttpRequests: boolean;
+	navigator: {
+		userAgent: string;
+	};
 	device: {
 		prefersColorScheme: string;
 		mediaType: string;
diff --git a/packages/happy-dom/src/window/Window.ts b/packages/happy-dom/src/window/Window.ts
index a600b5bd1..eb2093c02 100644
--- a/packages/happy-dom/src/window/Window.ts
+++ b/packages/happy-dom/src/window/Window.ts
@@ -140,6 +140,7 @@ import WindowErrorUtility from './WindowErrorUtility.js';
 import VirtualConsole from '../console/VirtualConsole.js';
 import VirtualConsolePrinter from '../console/VirtualConsolePrinter.js';
 import IHappyDOMSettings from './IHappyDOMSettings.js';
+import NavigatorUtility from '../navigator/NavigatorUtility.js';
 
 const ORIGINAL_SET_TIMEOUT = setTimeout;
 const ORIGINAL_CLEAR_TIMEOUT = clearTimeout;
@@ -210,6 +211,9 @@ export default class Window extends EventTarget implements IWindow {
 			disableIframePageLoading: false,
 			disableComputedStyleRendering: false,
 			enableFileSystemHttpRequests: false,
+			navigator: {
+				userAgent: `Mozilla/5.0 (${NavigatorUtility.getPlatform()}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${NavigatorUtility.getHappyDOMVersion()}`
+			},
 			device: {
 				prefersColorScheme: 'light',
 				mediaType: 'screen'
@@ -457,7 +461,7 @@ export default class Window extends EventTarget implements IWindow {
 
 		this.customElements = new CustomElementRegistry();
 		this.location = new Location();
-		this.navigator = new Navigator();
+		this.navigator = new Navigator(this);
 		this.history = new History();
 		this.screen = new Screen();
 		this.sessionStorage = new Storage();
@@ -488,6 +492,10 @@ export default class Window extends EventTarget implements IWindow {
 				this.happyDOM.settings = {
 					...this.happyDOM.settings,
 					...options.settings,
+					navigator: {
+						...this.happyDOM.settings.navigator,
+						...options.settings.navigator
+					},
 					device: {
 						...this.happyDOM.settings.device,
 						...options.settings.device
diff --git a/packages/happy-dom/test/window/Window.test.ts b/packages/happy-dom/test/window/Window.test.ts
index 4feb70ed1..916f51994 100644
--- a/packages/happy-dom/test/window/Window.test.ts
+++ b/packages/happy-dom/test/window/Window.test.ts
@@ -26,6 +26,15 @@ import '../types.d.js';
 import { beforeEach, afterEach, describe, it, expect, vi } from 'vitest';
 import VirtualConsole from '../../src/console/VirtualConsole.js';
 import VirtualConsolePrinter from '../../src/console/VirtualConsolePrinter.js';
+import NavigatorUtility from '../../src/navigator/NavigatorUtility.js';
+import PackageJson from '../../package.json';
+
+const GET_NAVIGATOR_PLATFORM = (): string => {
+	const processPlatform = process.platform;
+	const processPlatformCapitalized =
+		processPlatform.charAt(0).toUpperCase() + processPlatform.slice(1);
+	return 'X11; ' + processPlatformCapitalized + ' ' + process.arch;
+};
 
 describe('Window', () => {
 	let window: IWindow;
@@ -100,6 +109,9 @@ describe('Window', () => {
 				console: globalThis.console,
 				settings: {
 					disableJavaScriptEvaluation: true,
+					navigator: {
+						userAgent: 'test'
+					},
 					device: {
 						prefersColorScheme: 'dark'
 					}
@@ -119,6 +131,7 @@ describe('Window', () => {
 			expect(windowWithOptions.happyDOM.settings.disableCSSFileLoading).toBe(false);
 			expect(windowWithOptions.happyDOM.settings.disableIframePageLoading).toBe(false);
 			expect(windowWithOptions.happyDOM.settings.enableFileSystemHttpRequests).toBe(false);
+			expect(windowWithOptions.happyDOM.settings.navigator.userAgent).toBe('test');
 			expect(windowWithOptions.happyDOM.settings.device.prefersColorScheme).toBe('dark');
 			expect(windowWithOptions.happyDOM.settings.device.mediaType).toBe('screen');
 
@@ -136,6 +149,11 @@ describe('Window', () => {
 			expect(windowWithoutOptions.happyDOM.settings.disableCSSFileLoading).toBe(false);
 			expect(windowWithoutOptions.happyDOM.settings.disableIframePageLoading).toBe(false);
 			expect(windowWithoutOptions.happyDOM.settings.enableFileSystemHttpRequests).toBe(false);
+			expect(windowWithoutOptions.happyDOM.settings.navigator.userAgent).toBe(
+				`Mozilla/5.0 (${GET_NAVIGATOR_PLATFORM()}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${
+					PackageJson.version
+				}`
+			);
 			expect(windowWithoutOptions.happyDOM.settings.device.prefersColorScheme).toBe('light');
 			expect(windowWithoutOptions.happyDOM.settings.device.mediaType).toBe('screen');
 		});
@@ -432,11 +450,16 @@ describe('Window', () => {
 
 	describe('get navigator()', () => {
 		it('Returns an instance of Navigator with browser data.', () => {
+			const platform = GET_NAVIGATOR_PLATFORM();
+
 			expect(window.navigator instanceof Navigator).toBe(true);
+
 			const referenceValues = {
 				appCodeName: 'Mozilla',
 				appName: 'Netscape',
-				appVersion: '5.0 (Windows)',
+				appVersion: `5.0 (${NavigatorUtility.getPlatform()}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${
+					PackageJson.version
+				}`,
 				cookieEnabled: true,
 				credentials: null,
 				doNotTrack: 'unspecified',
@@ -451,13 +474,13 @@ describe('Window', () => {
 				},
 				onLine: true,
 				permissions: null,
-				platform: 'Win32',
+				platform,
 				plugins: {
 					length: 0
 				},
 				product: 'Gecko',
 				productSub: '20100101',
-				userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0',
+				userAgent: `Mozilla/5.0 (${platform}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${PackageJson.version}`,
 				vendor: '',
 				vendorSub: '',
 				webdriver: true